Question

Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is_____

Answer 1

Correct Answer: 3

To solve this problem, we must determine which compounds give both a red coloration with ceric ammonium nitrate and a positive iodoform test.

• Red coloration with ceric ammonium nitrate: This test is positive for alcohols. The presence of an -OH group in the compound indicates a positive result.
• Positive iodoform test: This test is positive for compounds like methyl ketones (R-CO-CH₃) or alcohols that can be oxidized to produce methyl ketones.

Correct answer is (c)
Three compounds meet the criteria for both tests, indicating the presence of specific functional groups reactive to these tests. These compounds contain functional groups that react with ceric ammonium nitrate and the iodoform test:

Ceric ammonium nitrate is used to detect alcohols and phenols, where the reaction forms a color change.

The iodoform test is specific for methyl ketones, where the formation of a yellow precipitate (iodoform) indicates the presence of the functional group.

Thus, the three compounds must contain alcohols, phenols, or methyl ketones to show a positive result for both tests.